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[Chemical Knowledge]：What are the upstream raw materials for polyester filament yarn? What do the downstream products contain?

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Polyester filament has an important position in the field of chemical production raw materials, and its upstream and downstream related products are numerous. This article will detail the upstream and downstream related products of polyester filament, including upstream raw materials, downstream products and related production processes.

1. upstream raw material

1. petroleum
polyester filament production raw materials mainly from oil. After a series of chemical reactions such as cracking and polymerization, petroleum can obtain the raw material monomers required for polyester filaments, such as ethylene glycol and terephthalic acid.

2. Coal
Coal can also be used as one of the raw materials for the production of polyester filament. Through coal chemical technology, coal can be converted into raw material monomer required for polyester filament.

2. Downstream Products

1. Textile
Polyester filament is one of the important raw materials for textiles, which can be used to produce all kinds of clothing, home textiles, industrial textiles, etc. Polyester filament has high strength, elasticity and wear resistance, so it is widely used in the field of textiles.

2. Non-woven
Polyester filament can also be used to produce non-woven fabrics. Non-woven fabrics are breathable, soft and easy to clean, and are widely used in medical, sanitary, filtration and other fields.

3. Industrial silk
Polyester filament can also be used to produce industrial silk, such as tire cord, transmission belt, rope, etc. Industrial silk needs to have high strength and wear resistance, so polyester filament is an ideal raw material for production.

3. production process

1. Polymerization reaction
Polyester filament production needs to go through the polymerization reaction, the raw material monomer into high polymer. The polymerization reaction is generally carried out by a solution polymerization method or a melt polymerization method.

2. Spinning molding
Polymers obtained by polymerization need to be spun to form polyester filaments. In general, a melt spinning method or a solution spinning method is used for spinning.

3. Post-processing
Polyester filaments also need to be post-processed during the production process, including drafting, heat setting, crimping and other processes to improve the physical properties and appearance quality of polyester filaments.

In short, polyester filament has many upstream and downstream related products, involving a wide range of fields. In the production process, it is necessary to strictly control the process parameters and quality indicators of each link to ensure the quality and performance of the final product.

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